If you could briefly sketch the schematic you suggested that would be amazingly helpful!
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I've attached the Primo EM272 datasheet.? Look at the diagram on the right, that's what I'm referring to.? In the place of the 5 volt battery you can use a 9 volt battery and a higher value resistor, say around 6-10k ohms.? You can use the same battery to power all three capsules, each through its own resistor.
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On the output side, you have an unbalanced signal with plenty of gain for a recorder.? You can put a resistor from the capacitor to your mic input, and if you connect two capsules that way you can adjust the resistor values to set the ratio between the capsules.? Or use a variable resistor, also called a potentiometer, so that you can adjust it while listening.
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This will work with electret capsules, it does not quite give you the "XLR mic input for a vocal mic" you were referring to.? However, you could build your own vocal mic using a cardioid pattern capsule and this same approach.?
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-Scott
